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(6+u)(-3)=20
We move all terms to the left:
(6+u)(-3)-(20)=0
We add all the numbers together, and all the variables
(u+6)(-3)-20=0
We multiply parentheses ..
(-3u-18)-20=0
We get rid of parentheses
-3u-18-20=0
We add all the numbers together, and all the variables
-3u-38=0
We move all terms containing u to the left, all other terms to the right
-3u=38
u=38/-3
u=-12+2/3
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